Suborder Odontoceti or toothed whales - These whales have teeth and a single blowhole. The number of teeth varies by species; it ranges from 2 (in some beaked whales) to 250 (some dolphins). They are smaller than baleen whales. Many species live in pods. Toothed whales have well-developed echolocation that they use to locate food (fish, squid, marine mammals, etc.) and other whales. Toothed whales have asymmetrical skulls.

Prosqualodon - a 7.5 feet (2.3 m) long extinct, toothed whale that resembled a dolphin. It dates from the Oligocene to the early Miocene. It had complex teeth, more like the Archaeoceti than the Odontoceti (the toothed whales).

family Eurhinodelphidae -

Eurhinodelphis - a 6.5 feet (2 m) long extinct, long-snouted porpoise with no teeth at the end of the snout. It dates from the mid to late Miocene. It had complex teeth, more like the Archaeoceti than the Odontoceti (the toothed whales).

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